Mike TurveyAn ongoing problem I've been running into is that run-of-the-mill rubber bands wear out surprisingly quickly. After a month or so of use, they start breaking down, showing minor cracks, and finally breaking. Stored rubber bands certainly don't break down so quickly (they last for years in my cupboard). I'm guessing that the big difference is light? UV radiation certainly could be attacking them and causing the wear patterns. Perhaps being under constant stress also plays a meaningful role?
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Thanks for the good suggestions. I just ordered a pack of 2-inch silicone cooking bands-- basically silicone rubber bands made for use in an oven or on a grill. I'm optimistic that they'll hold up a lot better-- I'll report back here how well they work.
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FYI: http://www.madsci.org/posts/archives/2011-02/1297969541.Ch.r.html
>Reaction of the rubber polymer, either at the double bond or at the allylic hydrogens, with ozone or oxygen or other oxidizing agents results in breaking the polymer chain. This weakens the bulk material and with time destroys the material. This weakening is noticeable in rubber articles such as rubberbands that have been around a while and have become brittle and cracked and have lost their ability to stretch.
Might want to look into "tension coil springs".
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Awesome project! I'm glad you've been able to make such a difference in your child's life!
Regarding the rubber bands, have you considered silicone o-rings? Or possibly Latex tubing, like the old school surgical tubing might work.
My last idea is slingshot tubing (which is usually latex tube anyways) is relatively inexpensive. https://simple-shot.com/diy/dipped-latex-slingshot-tubing-10/ 10ft for $5
You might have to come up with a joint piece though, since this tubing won't be a continuous loop like a rubber band.
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